Fumed silica A-200 (or comparable grades like Aerosil® 200) is widely utilized in completion fluid stabilization due to its nanoscale particle size (~12 nm), high surface area (~200 m²/g), and excellent suspension/thixotropic properties. Below are key application examples:

5. Stabilizing Acid-Soluble Completion Fluids
Challenge: Acid-soluble fluids (e.g., magnesium-based brines) require stable suspension of acid-soluble weighting agents (e.g., dolomite).
Solution: Fumed silica provides thixotropy without interfering with acid solubility.
Case Example: In a Middle East carbonate reservoir, a MgCl₂ brine with dolomite weighting material and 1% A-200K showed zero settling at 80°C for 96 hours. The fluid was fully dissolvable in 15% HCl during cleanup.
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